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Question from Marissa, a student:
The angles in a triangle measure 7x-1, 18x+2, and 5x+10. Determine whether the triangle is acute, obtuse, or right. State your reasons clearly.

Marissa,

What is the sum of these three expressions?

What is the sum of the angles in a triangle?

What are the angles? (It doesn't work out in very round numbers)

What sort of triangle must it be?

Good Hunting!
RD

 

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